This achievement is for Burial at Sea Episode 2.
I found the easiest place to get this is in the Service Bay. Following the main story path you will be told to go to the Service Bay to pick up a Bathysphere part.
As soon as you enter the large room in the Service Bay, look up and you will see a lot of Freight Hooks. Simply attach to one and look down below for a splicer. Once you find one, jump down behind them while pressing B in mid air to land silently and melee them. Jump back up and repeat two more times for the achievement. I obtained this by doing it in a row without reloading the checkpoint but feel free to reload the checkpoint if you mess up as it still counts towards the achievement.